WO1990003101A1 - Ameliorations apportees aux plaquettes de circuits imprimes - Google Patents

Ameliorations apportees aux plaquettes de circuits imprimes Download PDF

Info

Publication number
WO1990003101A1
WO1990003101A1 PCT/GB1989/001040 GB8901040W WO9003101A1 WO 1990003101 A1 WO1990003101 A1 WO 1990003101A1 GB 8901040 W GB8901040 W GB 8901040W WO 9003101 A1 WO9003101 A1 WO 9003101A1
Authority
WO
WIPO (PCT)
Prior art keywords
board
printed circuit
track
circuit board
rack according
Prior art date
Application number
PCT/GB1989/001040
Other languages
English (en)
Inventor
Brian Purdy Goddard
David John Pearce
Original Assignee
Racal-Milgo Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Racal-Milgo Limited filed Critical Racal-Milgo Limited
Publication of WO1990003101A1 publication Critical patent/WO1990003101A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0213—Electrical arrangements not otherwise provided for
    • H05K1/0263—High current adaptations, e.g. printed high current conductors or using auxiliary non-printed means; Fine and coarse circuit patterns on one circuit board
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/14—Mounting supporting structure in casing or on frame or rack
    • H05K7/1417—Mounting supporting structure in casing or on frame or rack having securing means for mounting boards, plates or wiring boards
    • H05K7/1418—Card guides, e.g. grooves
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/14—Mounting supporting structure in casing or on frame or rack
    • H05K7/1438—Back panels or connecting means therefor; Terminals; Coding means to avoid wrong insertion
    • H05K7/1457—Power distribution arrangements

Definitions

  • This invention relates to removable printed circuit boards, particularly but not exclusively large, complex boards making many- connections to the back plane of a unit.
  • connections may be made via tracks on the board itself, the edge of the board plugging into an edge connector, when large numbers of connections are involved it is customary to use connectors having multiple rows of pins or sockets (hereinafter reference is made to pins for simplicity), e.g. DIN 4162 96 way connectors having three rows of 32 pins.
  • pins e.g. DIN 4162 96 way connectors having three rows of 32 pins.
  • the pins in such connectors are necessarily quite fine and if these pins are to be used for carrying power to the board, a plurality of pins have to be parallelled up to provide adequate current carrying capacity. ⁇ This is not only wasteful use of pins but potentially unreliable. It also suffers from the problem that the power supply connections are made at the same time as the signal connections. ,
  • Fig. 1 is a plan view of a printed circuit board
  • Fig. 2 is a section to a larger scale through one edge of the board in its guide rail.
  • the printed circuit board 10 has a plurality of connectors 11 mounted along its rear edge for plug-in connection in conventional manner to complementary connectors on the back plane of a rack.
  • the rack can be essentially conventional, apart from its guide rails and is therefore not illustrated. It may accommodate a substantial number of printed circuit boards (cards) slid into the rack parallel to one another.
  • the pins of the connectors 11 are connected to the printed circuit board tracks and vents to the various components mounted on the board.
  • the power supply for the components is not provided through the connectors 11.
  • an extended track 12 running almost the length of the lefthand edge of the card. In this example this is the OV rail of the card.
  • the track 12 extends near to the back of the board.
  • Fig.2 there is shown a portion of the bottom wall 15 of a rack into which the cards are inserted lying in spaced, parallel, planes.
  • a guide rail 16 for slidably receiving one edge of the card 10.
  • This guide rail is formed from insulating material housing a resilient metal channel 18 having a metal tongue or tongues 19 such that the printed circuit board can be slid into the channel to be gripped reasonably firmly therein.
  • the tongue(s) 19 moreover make good electrical contact with the corresponding conductive track, e.g. the track 12, on the edge of the board.
  • the insulator is attached to the wall in any convenient manner, e.g. by rivets (not shown) through the base of the insulator registering with holes in the base of the metal channel 18, such that the latter is not shorted to the wall 15.
  • the channels 18 on the two edges of the printed circuit board are utilized as the means for conducting power to the board and are thus connected in this example to the OV and 5V terminals respectively of a power supply.
  • the OV track 12 initially makes contact with the OV channel 18, because this track 12 extends well towards the back of the boards.
  • the first operation on insertion therefore, in electrcal terms, is to establish signal ground throughout the board.
  • the first 5V track 13 (Fig.l) terminates a greater distance from the rear of the board than the track 12. Accordingly +5V is applied to the track 13 after OV has been applied to the track 12.
  • the 5V track 13 is connected to the components on the board 10 through a current limiting circuit 20 which serves to reduce the initial surge of current drawn by the card as the various capacitances thereon are charged up. This reduces the risk that the inserted card will cause a disturbance on the power supply sufficient to upset the operation of cards already inserted in the rack.
  • the conductive channels 18 in the rack are all permanently energised and it is intended that the insertion or removal of one card will not interfere with the running of the other cards in the rack.
  • An additional benefit with the method of power application is that signal lines can be suitably set prior to insertion into the signal connectors.
  • PCB self diagnostics can be carried out prior to insertion into the signal connectors.
  • Mechanical interlocking could be employed to prevent a faulty card reaching the signal connectors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Mounting Of Printed Circuit Boards And The Like (AREA)

Abstract

Une plaquette de circuit imprimé (10) s'emboîte dans une armoire à l'arrière de laquelle elle se connecte au moyen de connexions enfichables (11) qui sont montées le long de son bord arrière. Une première voie conductrice (12) et une seconde (13, 14) voie conductrice s'étendent le long des bords des deux côtés de la plaquette formant ainsi deux rails d'alimentation desservant les composantes montées sur la plaquette (10). L'armoire comporte une première glissière et une deuxième glissière, dans lesquelles se glissent les bords de la plaquette, et des fiches complémentaires pour se connecter au système de connexion de la plaquette (11). Les glissières comprennent des parties conductrices qui assurent le contact électrique avec leurs rails respectifs (12, 13, 14) pour les alimenter en courant. De préférence, l'un des rails (12) s'approche davantage du bord arrière que le deuxième rail (13, 14), qui, lui, est divisé en un rail (14) proche du bord antérieur et un rail (13) relié par une résistance (20) au rail (14) proche du bord antérieur de la plaquette.
PCT/GB1989/001040 1988-09-08 1989-09-05 Ameliorations apportees aux plaquettes de circuits imprimes WO1990003101A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8821072.9 1988-09-08
GB8821072A GB2222726A (en) 1988-09-08 1988-09-08 Printed circuit boards

Publications (1)

Publication Number Publication Date
WO1990003101A1 true WO1990003101A1 (fr) 1990-03-22

Family

ID=10643254

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1989/001040 WO1990003101A1 (fr) 1988-09-08 1989-09-05 Ameliorations apportees aux plaquettes de circuits imprimes

Country Status (3)

Country Link
EP (1) EP0403602A1 (fr)
GB (1) GB2222726A (fr)
WO (1) WO1990003101A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0465013A1 (fr) * 1990-06-29 1992-01-08 The Whitaker Corporation Système de distribution d'énergie en bordure de carte de circuit
WO1997049271A1 (fr) * 1996-06-18 1997-12-24 Siemens Aktiengesellschaft Bati pour cartes a circuits imprimes enfichables avec moyens pour la decharge amortie de potentiels electrostatiques
US6038139A (en) * 1996-06-18 2000-03-14 Siemens Aktiengesellschaft Mounting rack for plug-in electrical printed circuit board assemblies having means for damped dissipation of electrostatic potentials
US12016150B2 (en) 2019-10-12 2024-06-18 Inspur Suzhou Intelligent Technology Co., Ltd. Foldable conductive guide rail

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5063303A (en) * 1991-02-08 1991-11-05 Racal Data Communications Inc. Soft start circuit
US6422877B1 (en) * 2000-10-05 2002-07-23 Motorola, Inc. Apparatus for coupling power to an electronics module

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2254927A1 (en) * 1973-12-14 1975-07-11 Constr Telephoniques Current supply unit for printed cct boards - uses at least one current rail with contacts, perpendicular to cct boards
DE2850232A1 (de) * 1978-11-20 1980-05-22 Siemens Ag Einschubrahmen mit leiterplatte
WO1987005776A1 (fr) * 1986-03-21 1987-09-24 Cgr Ultrasonic Bac a cartes electroniques
EP0264686A1 (fr) * 1986-10-09 1988-04-27 Licentia Patent-Verwaltungs-GmbH Barres de maintien connectables à des barres profilées d'un support de plaquettes de composants

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB911379A (en) * 1960-09-27 1962-11-28 Rotax Ltd Method of forming a contact block for use in the reading of punched cards
US3546539A (en) * 1968-05-28 1970-12-08 Texas Instruments Inc Integrated circuit mounting panel
GB1399006A (en) * 1972-03-28 1975-06-25 Int Computers Ltd Circuit boards
GB1408203A (en) * 1972-09-19 1975-10-01 British American Tobacco Co Printed circuit cards
DK111577A (da) * 1977-03-15 1978-09-16 I O Pedersen Elektrisk kredsloebsplade

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2254927A1 (en) * 1973-12-14 1975-07-11 Constr Telephoniques Current supply unit for printed cct boards - uses at least one current rail with contacts, perpendicular to cct boards
DE2850232A1 (de) * 1978-11-20 1980-05-22 Siemens Ag Einschubrahmen mit leiterplatte
WO1987005776A1 (fr) * 1986-03-21 1987-09-24 Cgr Ultrasonic Bac a cartes electroniques
EP0264686A1 (fr) * 1986-10-09 1988-04-27 Licentia Patent-Verwaltungs-GmbH Barres de maintien connectables à des barres profilées d'un support de plaquettes de composants

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0465013A1 (fr) * 1990-06-29 1992-01-08 The Whitaker Corporation Système de distribution d'énergie en bordure de carte de circuit
WO1997049271A1 (fr) * 1996-06-18 1997-12-24 Siemens Aktiengesellschaft Bati pour cartes a circuits imprimes enfichables avec moyens pour la decharge amortie de potentiels electrostatiques
US6038139A (en) * 1996-06-18 2000-03-14 Siemens Aktiengesellschaft Mounting rack for plug-in electrical printed circuit board assemblies having means for damped dissipation of electrostatic potentials
US12016150B2 (en) 2019-10-12 2024-06-18 Inspur Suzhou Intelligent Technology Co., Ltd. Foldable conductive guide rail

Also Published As

Publication number Publication date
GB2222726A (en) 1990-03-14
GB8821072D0 (en) 1988-10-05
EP0403602A1 (fr) 1990-12-27

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